Telephone system.



J'. G. BLESSXNG.

TELEPHONE SYSTEM.

APPLIOATION FILED 001121,1911.

J. Gv. BLBSSING. TELEPHONE SYSTEM. Arpmnlournsn 00ml, 1911.

Patented Got. "i, i913.

2 SHEETS-SHEET 2.

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entran stares enfreint ernsten.

JCHN G. BLESSING, OF CHEAGO, ILINOS, ASSIGNOR TO AUTMTC ELECTRXC COMPANY, OF CHICAGO, ILLINOIS, A CORPRATION OF ILLINOXS.

meinerseits SYSTEM.

imi-miennes. r, isis.

Application filed October 21, 1911. Serial No. 655,950.

To oN ltlf/tom, t may concern "Be it known that l, J'o'iiN (jf. BLEssiNo, a citizen ot' the United States of merica, and resident of Chicago, Cook county, Illinois, have invented a certain new and useful improvement in Telephone Systems, of which the following is a specification. A

My invention rela-tes to telephone systems, and more particularly to automatic or semiautomatic telephonesystems in which the automatic switches employed in establish ing a connection between two subscribers lines are controlled over two sides ol' a metallic line circuit in series. In such systems it is usual to employ one or more slow acting` relays in the automatic switches in order to prevent the release of these .switches (lui-ingr the transmission of the impulses for operating said switches.

My invention relates particularly to a combined quick and slow acting line relay l'or use in such selector and connector switches. This relay takes the place of the ordinary line relay, and also ot' theusual slow acting release relay, thus greatly simplifying' the construction of these switches.

These and other objects of my invention will he more readily understood by refer ence to the accompanying drawings, in which- Figures l and 2 show diagrammatically a complete circuit. connection betweenv a cailA innv telephone and a. called telephone A in a system in which my improved relay lcircuits are used. Fig. 3 is a View showing the construction of the rela-y.

The connection shown in Figs. l4 and 2 is represented as being established through the medium oi? an individual switch C, first .selector lil, second selector F and a connector switch H.

The automatic substation with which .have elected to illustrate my invention com prises the usual receiver 26, switch hook 27 transmitter 28, ringer 29 and condenser 30.I

, Being an automatic substation it is provided with a pair of impulse springs 31 and 32 and an impulse wheel 33. The impulse wheel 33 carries on its periphery a number of impulsetceth and is secured' to a shaft 35, to which shaft there is also secured a. dial not shown) provided with finger holes. By means ot' the dial the impulse wheel may be rotated forward, after which it returned to normal vposition by a spring.

nient ot' the impulse wheel, each of the teeth 34 which passes the end of the spring 32 momentarily separates said spring from the spring 31. The number of teeth which are carried past the end of the spring 32 depends upon the digit called. lf desired, the telephone illustrated in British patent to S.' G. S. Dicker, No. 29,654- of 1910, may be substituted for the one shown in the drawings.

'.llhe line switch C, which is individual to the line of the substation A, and the master switch D are of the general type disclosed in British patent to lt. TV. James, No. 26,301

(not shown). During this backward moveof 1906, but of the particular form shown in i British patent to T. (if. Martin, No. 1419 of 1910. As herein illustrated, the line switch C comprises the usual plunger (not shown) attached to the end of the plunger arm 37., which arm is controlled by the magnet 38. Besides the Aplunger arm 37J`the magnet 38 also controls the relay armatures 39 and 40, and comprises four windings,- namely, a pull-in winding' 41, a cut-o Winding 42, a line winding'l and an autiliary Winding; l-l. lThe core of the inagnetl is provided near its center with a lateral projection 45, to which latter the mounting 46' for the armatures 89 and et() is attached. YW ith this arrangement the magnetic circuit of the windings lll and 42 is made separate vtrom that ofthe windings 48 and 4,4, and there fore the armatures on one end of the magnet are not affected bv. the windings upon the other end. @t the two windings upon the upper end ot" the magnet, the Winding;r il isthe stronger and, when energized, opertites both the plunger arm 37 and the arma-- tune 35). The Winding' 42, however, is not of suiticient strength to operate both arma-- titres, but will operate the armature 39 from its normal 'position and will hold the plun- Il,ser arm 37 in its operated position after it has once been attracted by the winding 4l.. Vhenthe plunger arm 37 is attracted, the plunger on the end thereof is forced into a `group of springs, forcing" the springs 47, t8, -t9 and 50 into engagement with the sprlnfas 5l. 52, 53 and 5&1-, respectively. Although l only one group of Springs (tiff-till) is shown.

each switch C is 'provided with a number of such zqroupso" springs, each gygup forming a terminal of a trunk line leaning to a selector Each ofl these trunk lines is comiofispov `douhlefwouird line relay 95 is similar to the .line relay of the selector E, as shown in Fig.

The li-n-e switch C and substation A are similar in all respects tothe line switch C and substation it (Fig. 1), The busy signaling machine shown at l is for the purpose of supplying busy signaling current to the line of the calling subscriber, in case the 'calling` subscriber' attempts to make connection with a liuc that is already in use.

.it B a batteriv is shown with its positive terminal preferably grounded.

Having given a general description of the apparatus, l will now explain the operation by which one subscriber, subscriber A, for example, obtains connection with another subscriber. subscriber A. for instance. The number of the substation A we will assume to be 2220. When the receiver is removed troni the switch hook at the substation A,

.. preparatory to making a call, the said hook rises. permitting the sprinfr 9G todisengage the spring 97 and to engage the spring 98,y

thereby opening the circuit of the ringer 29.

rilie engagement of the springs 9G and 98H places a bridge across the line conductors 99 and 100, which closes a circuit through the line winding e3 ot' the line switch (l. The closure ot this line circuit operates the line switch U in the usual manner to select an idle trunk extendinof to a selector switch E.

As this line switch rormsnopart of my pres-- ent invention, and as its operation is wellunderstood in the art. it is not thought necessary to describe itsl operation in detail. The calling subscriber now operates his calling dial in the usual manner for the first.

digit 2 ot the called-` number. As the impulse wheel 33 returns to normal position after being rotated with the dial for the digit 2, the impulse springs 31 and 32 are momentarily separated twice. The separation of the impulse springs 31 and 32 brealfis the energiaing circuit ot both ii'indings of the selector line relay 82. -s previously f stated, the relay 82 is the same as the -one shown in Eig. 3, and therefore the armature 7 acts quickly. thereby allowing the springs 123 and 19t. to engage durinfr the transmission ot the impulses troni tlie calling substation, while the armature 8 remains in its operatedposition to pli-event the springs 126 and 115 from disengaging the springs 127 and 116, respectively, between impulses. During the transmission of said impulses,

therefore, each time the armature 7-fallsj haelt a circuit closed thi-ou h the slowA relay 83. This circuit extends rom ground tl? through the springs 19,4 and 123, springs 120 and 127. slow relay 83, vertical magnet operated position tie relay $3 closes a cirv cuit through the private magnet 75. This g circuit extends from ground G3 through the springs 12S and 129, private magnet 75 and then to the battery lead 105. Alfter the last impulse for the first digit is delivered, the relay 83 denergizes and opens the'circuit of the private magnet 75, which in turn denergizes and permits the side switch to pass to second position. In passing from first to second position, the side switch wiper 74 disconnects the battery from the vettical magnet and closes a circuit through the rotary magnet 72. This circuit exthnds from `ground GrEi through the interrupter springs 130, rotary magnet 7 2 and side switch wiper 74 to the battery lead 105. The rut-ary magnet thereupon energizes to rotate* the shaft and shaft wipers one step,.to op n its own circuit at the interrupter springs 30 and to close the circuit of the private magnet 75. The private magnet 75 t erenpon energizes and remains in readiness tti-pass -tlie side switch lwipers to the third posit' n, when its circuit is broken. `When the c rcuit of the magnet 72 is broken at. the springs 130, the armature falls back, disconnectin the ground (l8 from the private magnet. first trunk upon the contactsA of which the selecto-r wipers havejust beenrot-ated is idle, the private imagnetfdenergizes, when the ground G5 is disqonnected and allowsthe side'. switch to. pass to third .position`.. If, however, the. 'first trunk is already'ivn use. the private Awiper '69V finds the first-.contact which more fully explained, and'maititains the private magnet energizedover the circuit exv IUD f' the f 11o it engages grounded, ""as will be hereinafterv tending from said grounded bank Contact through the .wiper 69', side switch wiper '73 and privatel magnetv'l''to the battery -lead 105. The private magnet thiis locks the side switch in second position and the rotary nnig'netcontihues to operate in a. manner similar to that of a buzzer'to advance the' wipers step by step until th'e private wiper 69 engages a non-grounded contact of an idle trunk. 4whereupon the private magnet denergizes and permits the' side switch to pass to third position.

The passage of the Side switch lfrom sec-1` 0nd vto third position opens theoperating circuit of the; rotary magnet 72 and closes i an 4energizing circuit through the line 71 and side switch wiper 74 to the battery i switching 'relay 84. This circuit extends .13o

'from ground G3 through the springs 115 and 'liuc relay 82 from. the liuc and extends the line .trom the calling substation through the wipeis (i8 snel 70 to the selector l?. After the relay 8l 'is ,eneigizefl but before its circuit is hielten by the telling back et the atmature 8 of the ielay S2, a new holding ciicuitis supplied to 'the ielajA 84: and the u/incliug [l2 ol the line switch C. rEllis cir cuit extends .from gesund G through the .springs 135 and 136, which were bi'ought into engagementupon the enegization of the relay 94a, the ciicuit. et the relay 9e having been completed upon the energization of the relay S41 of the selector EL tliiiough the 'wipes 59. tl ence one branch estencls th'ough the winflingg 42, while anothei.n brunch extends tlii'ough the side switch wipei '35 relay nl and side switch wipes@ 7l lo the battery lead 105. 'lllie disengagement of the springs 133 and. 13s' by the irolsy Sl ot the selector E opens the circuit ol? the ielcase magnet 76, thus preventing its energiZat-ion upon the de cueiggisstion ol.3 tile relay; 8:2.

Yheu the cullingn subscriber operates his {.zalling device to? tss second digit 2, the circuit ot the line relay Self* of the selectoiu l? is momentarily broken twice. The selector F operates in i'csponse to these impulses in exactly 'the saine manner as explained for the sclectoi' l?. to extend. the connection over the ini-unl; lines lil? und 13S to the connector H, the liuc relay of which immediately eine?n to vplace the usual liolflingg; and guui'clw ins; ground on the switches l?, E and llllicu the calling subscriber operates the ilial for the thinfl digi-t f2 azul the fourth lingua O., the coinectoiswitch .ll is operated.

to connect with the ncsu-ed called suhsc'ihers line. Ringing; curieut is then autol niatically supplieil'to the called suhscribcrs liuc 'leoni the ringing; gcneiatoi" lll. .The 0poi'ntion ot this switch is Well understood in the art, iely J5 operating in a manuel* similar to the ielsj; t5?, the sclectoz` switch' lfl. lu4 cass the called subscribers line is busy. :i busy signal is transmitted back to the calling; suliserihei"s line. This ope 'ation oi the c-zunfieclory :switch is Wellnnderstooclin the uit, anti it :accordingly thought unucccssluj/ to tlescfilis the. same further in clefail. The connection luc-tween the calling uml called sulasciihcss being' now couv plein l. they n ,y carry on an uuinteiiuptl cumeisatimi. 'The release ot the central u'licc mecha @u completed upon tlie noveno? hanging up of the receiver at the calling sub! station. The hanging up of this iecelver breaks 'the energizing circuit of the connector line i'elay 9. The relay 95, upon cleenergizing, permits its armature 2G to fall back, which disconnects the holiliug gro-unil from the line switching relays 84: and 184i ot the selectors E and F, respectively, and also disconnects the holding' ground from the cut-ott Winding 42 of the line switch C. v

lays 84 and 18sl of the selectors E and F7'ie Spectively, closes a cil-cuit through tli'cii le spective release magnets. This citcuit .in the selector E. toi* inst-ance,r ext-ends fioin giounfl G7 through the springs 124 anti 12?, 126' and; 188. 1325 and 134.-, oli not'mal spiupgs 7S and 'T7 and release magnet 'TG to 'out-1 teiy. The holding circuit tot* the winding l2 being broken allows the armature 39 and the plunger eiin 37 ot tlieiine switch Gto return to normal position, Ithus leaving all of the central olice mechanism in ezuliness for unotheif connection to .be set. up.

While l have tlesciibetl my invention in connect-ion with a particulasv type of telephone system, it is to be understood that l do not wish to be limited to such use, as it is obvious that my impovecl quick and slow acting relay lnay he used in connection With other types of systems, :intl may he used in any connection in which. ay quick and sion' acting relay would be useful and desirable.

l''hat l claim us my intention isc-m l. ln a telephone system, an antonuitic sjyitch having motion in one plume to selec' roups and motion in :in intersecting pleno tfilinfl u line in a selected gjoup, and nie incl uding a iclay tot controlling the operait'ion ot' Suid switch. said relay having a pair oi' s-imaluies. the operation of one ot saifl armatures being' sluggish :is compared with the operation oi the othci ot said armatures.

Lain a telephone system, au automatic switch', means imzluiliuu` u velay tor con` trollingY the operation of said. switch. plu i'alitv oi armatures for saitl ifelay, und means toi' proventi! one of said uilustuies troni coming' in contact withthe msgnet of' said relay. whereby said aiinati'uie is snuck acting as computed with the other ot said armatures.

1n a telephone system, un uutonuitie lilo Lorano? switch, means including a relay for controlling the operation offsaid switch, a plurality of energizing windings for said relay, means for energizing said windings over a line circuit in series, a plurality of arma tures for said relay, means vfor rapidly inteirupting said line circuit, means whereby one of said armatures, responds to said interruptions, and means for maintaining the other otlsaid armatures in attracted position` dur'nig the transmission of said impulses.

4. ln a telephone system, an automatic switch, means including a relay for cntrolling the operation ot said switch, said relay having a plurality of armatures, independent magnetic circuits for said armatures,.nfleans for transmitting a series of impurities, means whereby one ot said armatures "t'ibrates in. synchronism with said impulses, and means for maintaining the other of said armatures in operated position during the transmission of saidrimpulses..

'53. ln a telephone system, an automatic switch, means including a relay for controlling the operation o said switch, a plurality of energizing windings for said re.- lay, a plurality of armatures controlled by said relay.,4 said armatures having independent magnetic circuits, means for trans-' mitting a series of impulses through said energizing' windings, means whereby one of said armatures vihrates in synchronism with said impulses, and means for maintainingthe other of said armatures energized during the transmission of said impulses.

6. ln a telephonesystem, lines divided int/o groups, an automatic switch having motion in one plane to select groups and motion in a plane at right-angles thereto to find a line in a selected group, and means including a relay for controlling the operation of said switch, said relay having a pair of armatures, the operation of one of said armatures being sluggish as compared with the operation ot' the other of said armatures.

T. ln a telephone system, lines divided,

into groups, an automatic switch having motion in one plane to select groups and motion a plane at right-angles thereto to find a line selected group, meansincluding a relay for controlling the operation of said -f switch, a plurality of armatures for said relay, and means for preventing one of said armatures from coming in contact with the magnet oi said relay, whereby said armature is quick acting as compared with the other` of said armatures. A

8. .in a telephone system, lines :motion in. one plane to select groups and mm divided .1 into groups, an automatic switch having' tion in a plane at iight-angles thereto to find a line in a selected group, means including a relay for controlling the operation ot" said switch, a plurality of energizingwindings for said relay, means for energizing said windings over a line circuit in series, a plurality of armatures for said relay, means means whereby one of said armatures respends to said interruptions, and means for maintaining the other of said armatures in attracted position during the transmission of said impulses.

into groups, an automatic switch having motion in one plane to select groups and to find a line in a selected group, means including a relay for controlling the operation of' said switch, said relay having a plurality of armatures, independent magnetic circuits for said armatures, means for transmitt'in f a series of impulses, means whereby one o said armatures vibrates in synchronism with said impulses, and means for maintainingthe other of said armatures in operated position during the transmission of said impulses.

10. In a telephone system, lines divided into groups, an automaticswitch having motion in one plane to select groups and motion in` a plane at right-angles thereto to ind a line in a selected group, means including a relay for controlling the operationvot said switch, a lurality of energizing windings for said re ay, a plurality of armatures controlled br said relay, said armatures having indcpenf ent magnetic circuits, means for transmitting a series of impulses through said energizing windings, means whereby one of said armatures vihrates in synchronism with said impulses, and means for maintaining the vother of Said armatures energized during the transmission of saidl impulses.

1l. ln a telephone system, a relay, an energizing circuit therefor, a plurality of i magnetic circuits, a single armature in each l niagnetic circuit controlled hy a magnetic force therein, and means for varying the current in said energizing circuit, said current and magnetic forces being so related and of such character that the variations in the current cause,l an operation of one of the armatures only.

Signed by me at Chicago, Cook county, 5 Illinois, this 155th day of October, 191i. JOHN G. BLESSlNG.

Witnesses:

.ARTHUR J. Rar, Farms.

9. ln a telephone system, lines divided' motion in a plane at right-angles thereto.

for rapidly interrupting said line circuit,. 

